I'm starting CS at St. Andrews in September, where are you headed?
I'm basically getting a souped-up laptop which can play games reasonably well, and it'll suit other things too.
I was really looking at the Acer Travelmate 8104, it's pretty damn good. Either that or something with a similar spec.
Don't get a Pentium 4 based laptop - they just get really hot, make your laptop heavy and are easily outperformed. Get an Intel Centrino Pentium-M, or an AMD Turion (not an AMD64, they'll give you the same problems as the Pentium 4).
AMD is seen as better for hardcore gaming, whereas the Intel is better for ordinary levels of gaming and general all-round performance.
Good luck in your choice, let me know if you need any more help/guidance.
Master of common sense. If you don't like it, stop reading.